9th — CNN’s report that former FBI Director James B. Comey would dispute Mr. Trump’s claim he was told he was not under investigation.

10th — The New York Times’ report that the Trump administration had hidden a climate-change report.

11th— In Mr. Trump’s words, “RUSSIA COLLUSION!’ Russian collusion is perhaps the greatest hoax perpetrated on the American people. THERE IS NO COLLUSION!”

The web site asserted that “studies have shown that over 90 percent of the media’s coverage of President Trump is negative.”

It called 2017 “a year of unrelenting bias, unfair news coverage and even downright fake news.”

The president had promised supporters that he’d honor “the most corrupt & biased of the Mainstream Media,” after having pushed back the original date from Jan. 8.

On Twitter, Mr. Trump followed up the announcement by saying, “Despite some very corrupt and dishonest media coverage, there are many great reporters I respect and lots of GOOD NEWS for the American people to be proud of!”

“ISIS is in retreat, our economy is booming, investments and jobs are pouring back into the country, and so much more! Together there is nothing we can’t overcome—even a very biased media. We ARE Making America Great Again!” the president tweeted.

Ahead of the announcement, Arizona’s Republican senators, Jeff Flake and John McCain, criticized the president for feuding with the media.